Among American enthusiasts, it is common to refer to the different models by the number of their windows. The basic Kombi or Bus is the 11-window (a.k.a. 3-window bus because of three side windows) with a split windshield, two front cabin door windows, six rear side windows, and one rear window. The deluxe model featured eight rear side windows and two rear corner windows, making it the 15-window (not available in Europe). Meanwhile, the sunroof deluxe with its additional eight small skylight windows is, accordingly, the 23-window. From the 1963 model year, with its wider rear door, the rear corner windows were discontinued, making the latter two the 13-window and 21-window respectively. The 23 and later 21 window variants are usually described as Sambas.